Mr. Bosilong shook his head ruefully. “I am an honest man, Mma Ramotswe. I cannot abide wicked people.”

“None of us can,” she said.

“And it makes me very sad when I see a legal technicality allowing bad people to get away with it.”

“There is nothing worse than that,” she agreed, “because that means that not only does the wicked person get away with it, but people lose respect for the law of Botswana. That is not a good thing at all.”

Mr. Bosilong signalled that this was his feeling too. But then he said, “Of course, sometimes things go wrong in the law. Attorneys make mistakes. They file the wrong papers. They forget to do things.”

“Every one of us makes mistakes, Rra,” said Mma Ramotswe. She was not sure exactly what he was going to propose, but she wanted to encourage him. “And sometimes,” she went on, “a mistake is for the best.” She hesitated. “In fact, sometimes it is best to make an intentional mistake …”

Her words clearly brought him relief. “That is good to hear. You see …” His voice tailed off.

She spoke gently. “See what, Rra?”

“You see, I have made a mistake in that deed. I did not mean to make it, but I made it. I described the plot of land incorrectly. I put in the number of the neighbouring plot, and it is also the neighbouring plot in the land map that accompanies the deed. I was careless.”

A smile broke out on Mma Ramotswe’s face. “So Mr. Kereleng signed a deed that transferred his neighbour’s house rather than his?”

“I’m afraid so. Which makes me look very foolish.”

“And you didn’t tell him?”

Mr. Bosilong stared down at his desk. “Everything was done through her. I had my instructions from her. I should have advised him to get independent legal advice. I did not. It would not look good for me if there was a complaint.”

“So it’s a mess?”

“It’s a mess, Mma.”

But she did not think it was. “Tell me, Rra: If you took that deed to the land registry, what would happen?”

“It would be null and void. They would check it, and they would see the mistake. They would see that Mr. Kereleng does not have title to pass on the property in the deed. They would throw it out.”

“So you need to tell Violet Sephotho that the thing you did for her has not been done properly.”

“I will look very stupid.”

Mma Ramotswe rose to her feet. “You are not stupid, Rra. You have saved a man from being very badly treated. Your mistake was a good mistake. It was the best mistake I have heard of for a long time.”

“I cannot bring myself to tell her that the deed is void and that she must get out. It’s not easy, Mma.”